Sidus Ludoviciana

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Sidus Ludoviciana
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 13h 24m 51.8439s[1]
Declination +54° 53′ 50.905″[1]
Apparent magnitude (V) +7.58[2]
Spectral type A5[1]
Radial velocity (Rv) -4.9[2] km/s
Proper motion (μ) RA: -19.7[2] mas/yr
Dec.: -4.7[2] mas/yr
Other designations
Sidus Ludoviciana, HD 116798, SAO 28748, BD+55 1602, GC 18150, TYC 3850-257-1, 2MASS J13245185+5453509
Database references

Sidus Ludoviciana is an 8th-magnitude star in the asterism of the Big Dipper in the constellation Ursa Major, halfway between Mizar and Alcor. It was discovered on 2 December 1722 by Johann Georg Liebknecht, who mistook it for a planet and named it after Louis V, Landgrave of Hesse-Darmstadt. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly five times more distant.[3] It has the spectral type A8/F0 III.[4]


  1. ^ a b c Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335. Bibcode:1998A&A...335L..65H. 
  2. ^ a b c d "Stella Ludoviciana". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016. 
  3. ^ "A New View Of Mizar". Retrieved 2016-10-03. 
  4. ^ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS". Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489. 

External links[edit]